EP2326864B1 - Système de raccordement pour une centrale héliothermique - Google Patents

Système de raccordement pour une centrale héliothermique Download PDF

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Publication number
EP2326864B1
EP2326864B1 EP09781697.9A EP09781697A EP2326864B1 EP 2326864 B1 EP2326864 B1 EP 2326864B1 EP 09781697 A EP09781697 A EP 09781697A EP 2326864 B1 EP2326864 B1 EP 2326864B1
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EP
European Patent Office
Prior art keywords
tube
conduit
connecting system
conduit tube
rotation
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Active
Application number
EP09781697.9A
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German (de)
English (en)
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EP2326864A2 (fr
Inventor
Stefan Bürger
Francisco Ortiz Vives
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Senior Flexonics GmbH
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Senior Flexonics GmbH
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Publication of EP2326864A2 publication Critical patent/EP2326864A2/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/80—Accommodating differential expansion of solar collector elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
    • F24S30/425—Horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking

Definitions

  • the invention relates to a connection system for a solar thermal system with a pivotable about a rotation pipe according to the preamble of claim 1.
  • solar thermal power plants are increasingly being used today.
  • Such power plants usually have solar collectors, such as e.g. Parabolic mirror.
  • solar collectors solar radiation is trapped and transmitted via receiver tubes or absorber tubes into a carrier fluid, e.g. Thermo oil, delivered.
  • a carrier fluid e.g. Thermo oil
  • the higher-energy carrier fluid is transported. In this case, temperatures of 500 ° C or more can be achieved within the system or the pipes.
  • the solar collectors Since the solar collectors must be designed to be movable due to the apparent motion of the sun, the hot and pressurized carrier fluid carrying conduits often need to be also pivotable. However, they are always connected with stationary lines for the transfer of the carrier fluid. Due to the high temperatures and the high pressures, high demands are placed on the connections between the individual parts of a solar thermal system.
  • German patent application 10 2007 048 745 For example, a device is proposed by means of which at high temperatures and / or pressures a perfect mobility of the solar collectors is guaranteed.
  • a flexible pipe connection between a fixed line and an absorber tube is arranged and provided a means for torque-free and / or force-free connection of the flexible pipe to the absorber tube.
  • gases or liquefied salts could be used, which allow the transport of solar heat from an absorber pipe to the power plant at temperatures of 500 ° C.
  • the invention is based on the problem to provide a connection system for a solar thermal system with a pivotable about a rotation pipe, which achieves a longer and safer life even at high temperatures and / or pressures of a carrier fluid located in the conduit.
  • a connection system for a solar thermal system is provided with a pivotable about a rotation axis conduit which is filled with a carrier fluid, wherein the conduit extends between two ends and for transporting the carrier fluid at a first end via a metal hose as a flexible pipe connection with a stationary Solid line and is connected at its second end via at least one connecting means with another conduit.
  • the conduit is mounted in such a way that the metal tube only experiences forces acting perpendicularly to the axis of rotation and the connecting means experiences forces acting only parallel to the axis of rotation.
  • the metal tube can be optimally designed at the first end for a bending stress perpendicular to the axis of rotation of the conduit, which acts as a result of the pivotal movement of the conduit and the fixing of the metal tube to the fixed fixed line on it.
  • a stress of the metal tube by a force parallel to the axis of rotation, e.g. by a thermal expansion of the conduit, does not take place.
  • a complex multiaxial stress state is avoided and the metal tube is not additionally stressed by torsion.
  • the connecting means for connecting the one conduit with another conduit can be designed specifically for a force compensation along this one direction of action. Since the further conduit is e.g. as part of another solar collector unit is also pivotable about the common axis of rotation, the connecting means so no bending perpendicular to the axis of rotation or must not withstand such a load.
  • conduit is mounted such that the conduit can expand in thermal expansion along the extension direction of the conduit only in the direction of its second end.
  • the conduit can be fixed in the region of its first end in its direction of extension and be slidably guided in the region of its second end. It is with others Words, the conduit with its first end firmly clamped at a fixed point in the axial direction. In this case, the fixed point is preferably immediately before the connection to the metal hose. At the opposite end, the conduit is so "loose” stored that it is indeed supported or clamped in the radial direction, but can continue to expand along its extension direction.
  • the conduit is preferably guided at its second end in a sliding bearing. This then allows a thermal expansion of the conduit, which may well be on the order of 70cm due to the high operating temperatures.
  • the conduit is connected in the region of its two ends in each case with a connecting structure which is mounted pivotably together with the conduit about the axis of rotation, and wherein the connecting means facing connecting structure is additionally mounted also longitudinally pivotable about the axis of rotation.
  • the connecting means undergoes forces acting almost only parallel to the axis of rotation. These forces are passed through the pivotal movement of the connecting structure to the connecting means for compensation.
  • the pivot radius along the axis of rotation is many times greater than the elongation or shortening of the conduit, so that act as a result of the pivotal movement of the connecting structure no relevant lateral forces on the conduit.
  • connection structure mounted so as to be pivotable along the axis of rotation can be pivoted along the direction of extension of the conduit along the axis of rotation as a result of thermal expansion of the conduit. In other words, only by the stretching or shortening of the conduit due to a change in temperature, the one connecting structure is pivoted along the axis of rotation.
  • the inventive bearing a specific stress on the respective ends of the conduit without torsion overlap is created so that comparatively simple components can be used that can withstand the specific load case permanently.
  • no complex constructions are necessary, with which, for example, must be ensured between the fixed line and conduit that when pivoting the conduit both an expansion and a rotation of the conduit can be compensated.
  • elaborately sealed connection systems are used whose seals can not withstand the given loads permanently.
  • connection system would also be suitable for a more chemically aggressive carrier fluid, such as the liquid salts already described, for which e.g. At an operating temperature of 500 ° C, no permanent seals are known.
  • the flexible metal tube compensates for rotation of the conduit during pivoting, so bends perpendicular to the axis of rotation. Since it experiences no forces parallel to the axis of rotation, no torsional stresses are generated, which can accelerate material fatigue. Also, additional force compensation designs, e.g. Joints, not necessary and the flexible metal hose can also be used for higher temperatures and pressures of a carrier fluid than before.
  • the solid line is additionally stored or fixed in such a way that it expands or shortens during an expansion or contraction only at an end opposite the metal tube. In this way it is ensured that no additional force component acts on the metal tube parallel to the axis of rotation and generates torsional stress due to the solid line.
  • connection means For the power consumption parallel to the axis of rotation, significantly eg due to the thermal expansion of the conduit, which can occur only at the second end, also known connection means can also be used. These must be suitable, for example, only to compensate for the expansion of the conduit and experience no additional forces across it.
  • the at least one connecting means is an axial compensator provided between the connected conduits, in particular an axial compensator loaded externally.
  • At least one connecting means has at least one flexible metal hose which is arranged in a U-shape between the two connected conduits.
  • only one metal tube can be provided in U-shape, wherein the two legs of the U-shape are substantially perpendicular to the axis of rotation.
  • two flexible, interconnected metal hoses may be provided for improved compensation of the thermal expansion, each forming a leg of the U-shape consisting of two legs.
  • At least one connecting means is a compensator joint system with pipelines connected via compensators.
  • an inserted flexible metal hose is designed as a multi-walled metal corrugated hose. This applies both to use as a pipe joint at the first end of the conduit as well as for use as a connecting means at the second end.
  • the conduit in a particularly preferred embodiment is an absorber tube of the solar thermal system in which energy is supplied to the carrier fluid via solar collectors.
  • the solar thermal system may in particular have parabolic channel mirrors, which are pivotable about the axis of rotation.
  • parabolic trough power plants are created, whose solar collectors parabolic trough mirrors and arranged therein receiver tubes (also called absorber tubes) have. With these parabolic trough mirrors, the solar radiation is captured and delivered via the absorber tubes to the carrier fluid contained therein.
  • Fig. 1 is a solar thermal system with two juxtaposed parabolic trough mirrors 12 is shown.
  • the carrier fluid to be heated by the solar radiation eg oil, gases or liquefied salt
  • absorber tubes 4 also called receiver tubes
  • the respective absorber tube 4 is guided via a connecting structure 5 above the curved surface of the parabolic trough mirror 12 and mounted with its two opposite ends 4a, 4b on the connecting structure 5.
  • the connection structure 5 projects in the view shown on two side edges of the parabolic trough mirror 12, so that the parabolic trough mirror 12 is located therebetween.
  • the parabolic trough mirrors 12 of the solar thermal system must be tracked in the course of the day to the changing position of the sun and can therefore be pivoted about an axis of rotation A along a pivoting movement 6.
  • the connecting structure 5 in each case has a rotary bearing 1 in the region of the parabolic trough mirror 12 and at the bearing point for the absorber tube 4, so that a thermal expansion 2 of the associated absorber tube 4 parallel to the axis of rotation A does not lead to a bending of the absorber tube 4 between the two connecting structures 5, 5 leads.
  • the absorber tube 4 is further connected in the region of a first end 4a via a flexible metal tube 3 as a pipe connection with a fixed fixed line 15.
  • This fixed line 15 is immovably fixed and can not change its position when pivoting the absorber tube 4 about the axis of rotation A.
  • the metal hose 3 is thus connected at one end 3b to the absorber pipe 4 and at another end 3a to the fixed line 15.
  • the hot and pressurized carrier fluid can be fed into the fixed line 15 and further transported, the flexible metal tube 3 can be bent at least perpendicular to the axis of rotation A along the pivoting movement 6.
  • the metal tube 3 is therefore designed and arranged so that it performs a spiraling up and rolling movement during the pivoting movement 6 of the parabolic trough mirror 12.
  • the force introduction for the hose bending takes place at its one end 3b by the centering of the parabolic mirror 12 mitschwenkende absorber tube 4.
  • the absorber tube 4 is rotatably mounted in the region of its ends 4a, 4b on the connecting structure 5 via a respective further rotary bearing 1, so that possible no force due to the pivoting movement 6 acts on the absorber tube 4.
  • an elongation of the absorber tube 4 is allowed.
  • the two absorber tubes 4, 4 are also each connected to a flexible metal tube 3 in the region of their respective end 4b.
  • the two metal hoses 3 are again in contact here via a rigid connecting piece 3c through which the carrier fluid can also be transported.
  • the thermal expansions of the connected pipelines acting parallel to the axis of rotation A or transverse to the pivoting plane between the fixed pipe 15 on the one hand and the absorber pipe 4 on the other hand are also to be absorbed.
  • the absorber tubes 4, 4 extend along their longitudinal extent in the direction of both ends 4a and 4b and therefore have a thermal expansion 2 on both sides.
  • FIG. 2A a Dreigelenksystem shown, which consists of individual intermediate tubes or pipe segments 31 and 32, which are connected to each other via a pipe joint 33.
  • This Dreigelenksystem is used instead of the flexible metal hose 3 between the fixed line 15 and the absorber tube 4. Accordingly, one of the intermediate tubes 31 is connected at its end 31 b to the absorber tube 4.
  • the Fig. 2A further shows various positions 30 ', 30 "and 30'" of the three-joint system at different large pivoting of the absorber tube 4 with the connecting structure 5 about the axis of rotation A.
  • Analog is in the Fig. 2B a basically similar embodiment for the connection of two absorber tubes 4, 4 shown.
  • a pipe joint 34 is provided, which is connected to a pipe segment 35a.
  • a transition section 36 which serves to connect to another pipe segment 35b.
  • the two pipe segments 35b of the individual absorber pipes 4, 4 to be connected are then connected to one another.
  • longitudinal expansion positions 300 and 300 ' can be seen how this construction compensates a thermal expansion 2 of the absorber tubes 4, 4.
  • the longitudinal expansion position 300 shows a cooler operating state than the longitudinal expansion position 300 '.
  • the Dreigelenksystem shown, the pipe joints 33 and 34 are called in this type of "balljoint", can thus compensate for linear movements. It thus assumes the pivoting movement 6 and to a limited extent, the thermal expansion 2 transverse to the pivoting plane.
  • the pipe joints 33 and 34 are provided with seals that are subjected to such a rotation during rotation about the axis of rotation A.
  • the constructions shown are therefore usually for thermal oil as a carrier fluid with an operating temperature of max. 400 ° C and an operating pressure of 23 bar used.
  • thermal oil for thermal oil as a carrier fluid with an operating temperature of max. 400 ° C and an operating pressure of 23 bar used.
  • liquid salt for the use of liquid salt at 500 ° C as the leading carrier fluid, there is still no suitable sealing material that can withstand the load due to the pivoting movement 6 and thermal expansion 2 permanently.
  • additional flexible elements such as the pipe joints 33, 34, or pipe segments 31, 32 and 35 a, 35 b are installed, whereby the construction is expensive and difficult to install.
  • Such a rotary leadthrough 8 then also connects two identically designed metal hoses 7, 7 between two absorber tubes 4, 4.
  • a rotary feedthrough 8 it is according to the Fig. 3B possible to use instead of a flexible metal tube 7, a rigid, Z-shaped tube member 40 that is provided with compensators 160.
  • a compensator 160 similar to the pipe joints 33 and 34 of the Fig. 2A and 2 B
  • the tube part 40 is fixed at one end about the rotary feedthrough 8 in its position rotatable about axis of rotation A, thus acting as a result of the thermal expansion 2 on the tube member 40 Force to be compensated parallel to the axis of rotation A.
  • the tube part 40 is accordingly deflected at its end connected to the end 4b of the absorber tube 4 parallel to the axis of rotation A different relative to the fixed rotary feedthrough 8.
  • the resulting angular offset is compensated by the compensators 160, which are arranged between the end 4b and the tube part 40 or between the tube part 40 and the rotary feedthrough 8.
  • the present invention solves the problem described by an arrangement of proven elements that are suitable for the operating conditions and in particular in the long term in the use of salt, or alternative media as a liquid or gaseous heat carrier, are resistant to the operating parameters mentioned.
  • the absorber tube 4 is mounted such that each element only the load is allocated, for which it is permanently well suited. This is achieved in the present example by a targeted arrangement of fixed points or fixings 9 and plain bearings 17, which protect the components connected to the absorber tube 4 from biaxial movement influences.
  • a flexible metal tube 13 is used as a pipe connection between the end 4a of the absorber tube 4 and the fixed line 15. This is essentially true with the metal tube 3 of Fig. 1 pure and could for example be a metal corrugated hose.
  • axial fixings 9 are provided along the tube axes of the fixed line 15 and the absorber tube 4, so that, for one, the fixed line 15 does not stretch in the direction of the end 13a and the absorber tube 4 does not extend in the direction of the end 13b of the metal tube 13 or in the opposite direction can.
  • This is achieved for example by appropriate bearings, brackets or stops, which cooperate eg with shaft paragraphs of the absorber tube 4, which are known in principle.
  • connection structure 5 associated with the end 4a is provided with a fixing 9 in the region of the parabolic trough mirror 12, so that a pivoting of this connection structure 5 transversely to the axis of rotation A is not possible.
  • a fixed point is provided by an axial fixation 9 on the fixed line 15.
  • the absorber tube 4 and the fixed line 15 can thus each extend only in the direction away from the metal tube 13 direction.
  • the metal tube 13 In the pivoting movement 6 of the parabolic mirror 12 by e.g. up to 270 °, the metal tube 13 is thus arranged so that it performs a spiraling up and rolling movement in one plane.
  • the metal tube 13 used here is free of all other movements. As a result, an additionally occurring in the metal hose 13 torsion can be prevented, which would contribute significantly to the material fatigue.
  • Such a metal tube 13 is pressure-tight and vacuum-tight without additional seals and is therefore permanently resistant to liquid salts at over 500 ° C.
  • connection structure 5 provided at the end 4b of the absorber tube 4 is designed to be pivotable about the pivot bearing 1 along the axis of rotation A.
  • an axial compensator 14 is shown as connecting means.
  • This Axialkompensator 14 in the form of a metallic bellows compensator connects the two absorber tubes 4, 4 in alignment with each other and allows the compensation of the longitudinal thermal expansion 10 parallel to the axis of rotation A. Due to the synchronous course of the pivotal movements 6, 6 of the two absorber tubes 4, 4 learns the Axialkompensator Consequently, no bending forces transverse to the axis of rotation A and transverse to the longitudinal axis of the absorber tubes 4, 4.
  • the axial compensator 14 Since always provided for operational reasons for a maximum synchronous operation, the axial compensator 14 will be charged only by the intended (longitudinal) movement under operating conditions and there are none Tension due to torsion too fear. Seals are not required within the Axialkompensators 14, so that here is a permanent design for the most demanding carrier fluids that are to pass through the axial compensator 14 through, readily possible.
  • FIG. 5A An alternative embodiment is with the Figs. 5A to 5C shown. These put in with the Fig. 4 Consistent, perspective side view of the solar thermal system is, with a difference in the design of the connection of the two absorber tubes 4, 4 is.
  • an axial compensator 14 here a U-shaped arrangement or U-shape 11 of two flexible metal hoses 111 and 112 is selected which is provided between the connection structure 5 of one absorber tube 4 and the connection structure 5 of the other absorber tube 4.
  • the metal tube 111 with the end 4b of the one (in the Fig. 5A the left) absorber tube 4 and the metal tube 112 with the end 4b of the other (in the Fig. 5A the right) absorber tube 4 is connected.
  • the two metal hoses 111 and 112 each form one of the opposite legs of the U-shape 11 and are connected to each other via a rigid piece of pipe 110 at the foot of the U-shape 11.
  • the metal tubes 111, 112 extend substantially parallel to each other and perpendicular from the longitudinal axis of the absorber tubes 4, 4 in the direction of the axis of rotation A.
  • the metal hoses 111, 112 are each encompassed by a holding frame 50 or are guided through the holding frame 50.
  • This holding frame 50 is rigidly connected to the respective connecting structure 5, so that it can be pivoted together with the connecting structure 5 and the absorber tube 4 about the axis of rotation A.
  • the metal hoses 111 and 112 experience due to the illustrated storage of the absorber tubes 4, 4 respectively only forces acting as a result of the unilateral thermal expansion of the absorber tubes 10 4, 4 parallel to the axis of rotation A and are to be compensated. Consequently, a force is introduced into the metal tube 111 or 112 respectively only at its connection to the end 4b of the absorber tube 4 along the aligned with the axis of rotation A longitudinal axis of the absorber tube 4.
  • this may mean that the cooling absorber tube 4 contracts and thus a force parallel to the axis of rotation A in the direction of the end 4a acts or that the heating absorber tube 4 expands and thus a force acts parallel to the axis of rotation A in the direction of the other absorber tube 4.
  • the metal hoses 111 and 112 are flexible and connected to each other via the rigid pipe piece 110 at the foot of the U-shape 11, the metal hoses 111 and 112 are subjected to bending only. Also, due to the limitation by the holding frame 50, the metal hoses 111 and 112 will therefore bulge only in the plane defined by the longitudinal axis of the respective absorber tube 4 and the axis of rotation A, to compensate for the expansion or contraction of the absorber tubes 4.
  • FIG. 5A heated state of the absorber tubes 4, 4 shows the Fig. 5B , Herein followed in both illustrated absorber tubes 4, 4 due to the axial strain limitation (fixations 9) in the region of the ends 4a a one-sided longitudinal thermal expansion 10 of the absorber tube 4 respectively in the direction of the opposite, aligned absorber tube 4th
  • the longitudinal thermal expansion 10 leads to an extension of the absorber tube 4 in the region of the end 4b.
  • This extension can for example be done only relative to the connection structure 5 at the second end 4b by a corresponding sliding or guide bearing is provided.
  • the absorber tube 4 would then extend at the end 4b only relative to the connection structures 5 remaining perpendicular to the axis of rotation A.
  • the connecting structure 5, which is connected to the end 4b of the absorber tube 4 can be pivoted longitudinally to the axis of rotation A by means of the rotary bearing 1 in order to allow the unilateral longitudinal thermal expansion 10.
  • the connection structure 5 connected in each case to the absorber tube 4 in the region of the end 4b is thus determined starting from the in FIG Fig. 5A shown state when heating the absorber tube 4 in the direction of the other absorber tube 4 along the axis of rotation A and about the pivot bearing 1 tilted or pivoted.
  • the metal hoses 111 and 112 are bent according to the load occurring to compensate for the forces acting parallel to the axis of rotation A forces.
  • the metal hoses 111 and 112 have been approximated to each other at the upper ends of the original U-shape 11, while at the foot of the original U-shape 11 their distance over the rigid pipe section 110 remains fixed. They are accordingly bent or curved, so that the original U-shape 11 is wider below the support frame 50 and the thus defined space between the metal hoses 111 and 112 and the pipe section 110 is more bell-shaped.
  • the support frame 50 can be axially displaced, i. be open parallel to the axis of rotation A, since he significantly contributes to the entrainment of the metal tubes 111, 112 in the direction of rotation.
  • Fig. 5C is a starting from the Fig. 5A Cooled or cooler state of the solar thermal system shown.
  • the two mutually opposite connection structures 5, 5 of the two interconnected parabolic trough mirrors 12, 12 are again mounted so that they are capable of both towards and away from each other and thus pivoted or tilted in the direction of the center of the associated parabolic trough mirror 12 to become.
  • the absorber tube 4 has been shortened in each case, so that the connection structure 5 mounted so as to be pivotable via the pivot bearing 1 is in each case tilted in the direction of the other connection structure 5 of the corresponding parabolic trough mirror 12.
  • the attached between the two parabolic trough mirrors 12, 12 for connecting the absorber tubes 4, 4 metal hoses 111, 112 allow this tilting of the pivotally mounted connection structures 5, 5 between the two parabolic troughs 12, 12 and compensate for the forces occurring parallel to the axis of rotation A. They therefore deviate from in the Fig. 5A shown U-shape 11 as a warmer initial state and form a substantially V-shape.
  • the absorber tubes 4, 4 are heated, the upper end of the pivotally mounted connecting structure 5 connected to the respective absorber tube 4 is moved in the direction of the other parabolic trough mirror 12.
  • the connected to the absorber tubes 4, 4 of the associated parabolic trough 12, 12 ends of the pivotally mounted connection structures 5, 5 are therefore in a change in length of one or both absorber tubes 4, 4 along the rotation axis A to each other or away from each other guided.
  • the metal hoses 111 and 112 together with the pipe section 110 is substantially a V-shape, the in Fig. 5C or similar to a 180 degree rotated V-shape or A-shape, respectively Fig. 5B is shown.
  • connection structure 5 On the slide bearing 17 in the region of the end 4b of the absorber tube 4 can also be provided for connection to the connection structure 5 a fixation 9, so that a one-sided longitudinal thermal expansion 10 directly and directly on the pivotally mounted connection structure 5 acts and their tilting about the pivot bearing 1 conditionally , Alternatively, it can be provided that the absorber tube 4 is brought into contact with the pivotably mounted connection structure 5 only after a predetermined thermal expansion or shortening of the absorber tube 4 4 in such a way that the connection structure 5 is pivoted. For this purpose, for example, a first of the connection structure 5 spaced stop on the absorber tube 4 is conceivable, which rests only at sufficient extension or shortening of the absorber tube 4 to the connecting structure 5.
  • the mounting state of the solar thermal system in the Fig. 5C in the example shown corresponds to state and in operation thereof starting in Fig. 5A shown warmer state is taken.
  • FIG. 6 Another alternative embodiment is with the Fig. 6 shown.
  • a compensator joint system 16 * is provided instead of the U-arrangement of one or two flexible metal hoses 111, 112 for connecting the two absorber tubes 4, 4.
  • two Z-shaped bent pipes 40 are used, which have a central portion which is many times longer than the bent beginning and end portions.
  • the initial section is connected in each case via a compensator 161 to the end 4b of the absorber tube 4.
  • the end portion is connected in each case via a further compensator 161 with a short rigid and straight pipe 40c, via which thus the two pipes 40, 40 are connected.
  • the compensator joint system 16 * thus formed also lies in the plane defined by the longitudinal axis or the extension direction of the absorber tubes 4, 4 and the axis of rotation A. Likewise, in each case the middle section of the pipeline 40 is guided through a holding frame 50 of the connecting structure 5.
  • the said flexible metal hoses 13, 111, 112 are furthermore all-metal corrugated hoses, in particular multi-walled corrugated metal hoses.
  • flexible metal tubing as a connecting means between the parabolic trough mirror 12 and parabolic trough mirror units may also be conceivable to use elastic elements that apply a counteracting restoring force under load.
  • the absorber tube 4 is mounted as a conduit of the solar thermal system such that at each end 4a, 4b of the absorber tube 4 there is only a specific and non-superimposed load state essentially in a single plane.
  • it can additionally be provided to fix or store the fixed line 15 in such a way that it expands or contracts during expansion or contraction only at the end which is opposite the end 13a of the flexible metal tube 13.
  • the connecting means take only the one-sided thermal expansion 10 of the connected absorber tube 4 in a plane and no other movements.
  • connection system is that even these elements, hose 111, 112, pipe 40, 40c or compensators 161, are only loaded by the intended movement under operating conditions and no tensions due to torsion are to be feared. This achieves an easily calculable service life and a high level of protection against premature failure.
  • embodiments of the invention are described in connection with parabolic mirrors 12 as part of a solar collector unit.
  • embodiments of the invention can also be used in other types of solar thermal power plants which have a pivotable conduit with a carrier fluid which is heated by the solar radiation.
  • other basic arrangements of the solar collectors are possible.
  • the invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants are conceivable that make use of the device according to the invention even with fundamentally different types of use.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Supports For Pipes And Cables (AREA)

Claims (15)

  1. Système de raccordement pour une centrale héliothermique avec un conduit (4) pouvant pivoter autour d'un axe de rotation, qui est rempli d'un fluide porteur, dans lequel le conduit (4) s'étend entre deux extrémités (4a, 4b) et est raccordé pour le transport du fluide porteur à une première extrémité (4a) par un tuyau souple métallique (13) en tant que liaison tubulaire flexible avec une conduite rigide fixe (15) et à sa deuxième extrémité (4b) par au moins un moyen de liaison (11, 14, 16*) à un autre conduit (4), caractérisé en ce que le conduit (4) est monté de telle manière que le tuyau souple métallique (13) ne subisse que des forces agissant perpendiculairement à l'axe de rotation (A) et que le moyen de liaison (11, 14, 16*) ne subisse que des forces agissant parallèlement à l'axe de rotation (A).
  2. Système de raccordement selon la revendication 1, caractérisé en ce que le conduit (4) est monté de telle manière que le conduit (4) ne puisse se dilater qu'en direction de sa deuxième extrémité (4b) lors d'une dilatation thermique (2, 10) le long de la direction d'extension du conduit (4).
  3. Système de raccordement selon la revendication 1 ou 2, caractérisé en ce que le conduit (4) est fixé dans la région de sa première extrémité (4a) dans sa direction d'extension et est guidé de façon glissante dans la région de sa deuxième extrémité (4b), en particulier en ce que le conduit (4) est guidé à sa deuxième extrémité (4b) dans un palier lisse (17).
  4. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que le conduit (4) est relié dans la région de ses deux extrémités (4a, 4b) respectivement à une structure de liaison (5, 5), qui est montée de façon pivotante autour de l'axe de rotation (A) en même temps que le conduit (4), et dans lequel la structure de liaison (5) tournée vers le moyen de liaison (11, 14, 16*) est en plus montée de façon pivotante longitudinalement à l'axe de rotation (A).
  5. Système de raccordement selon les revendications 2 et 4, caractérisé en ce que la structure de liaison (5) montée de façon pivotante longitudinalement à l'axe de rotation (A) peut pivoter longitudinalement à l'axe de rotation (A) par suite d'une dilatation thermique (2, 10) du conduit (4) le long de la direction d'extension du conduit (4).
  6. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que la conduite rigide (15) est montée ou fixée de telle manière qu'elle s'allonge ou se raccourcisse lors d'une dilatation ou d'une contraction uniquement à une extrémité opposée au tuyau métallique (13).
  7. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce qu'aucun joint n'est nécessaire à l'intérieur du système de raccordement, à partir de la conduite rigide (15) jusqu'à l'autre conduit (4).
  8. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'au moins un moyen de liaison (11, 14, 16*) est un compensateur axial (14) prévu entre les conduits reliés (4, 4), en particulier en ce que le compensateur axial (14) est un compensateur axial soumis à une pression extérieure.
  9. Système de raccordement selon l'une quelconque des revendications précédentes 1 à 7, caractérisé en ce que ledit au moins un moyen de liaison (11, 14, 16*) présente au moins un tuyau métallique flexible (111, 112), qui est disposé sous une forme de U (11) entre les deux conduits reliés (4, 4).
  10. Système de raccordement selon la revendication 9, caractérisé en ce qu'il est prévu deux tuyaux métalliques flexibles (111, 112) reliés l'un à l'autre, qui forment respectivement une branche de la forme en U (11) composée de deux branches.
  11. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit au moins un moyen de liaison (11, 14, 16*) est un système articulé de compensateur (16*), avec des conduites (40) reliées par des compensateurs (161).
  12. Système de raccordement selon l'une quelconque des revendications précédentes 9, 10 ou 11, caractérisé en ce que le tuyau métallique flexible (111, 112) ou une des conduites (40) est guidé(e) dans un cadre de maintien (50), qui exécute avec le conduit (4) le mouvement de pivotement (6) autour de l'axe de rotation (A).
  13. Système de raccordement selon la revendication 9, ainsi que selon l'une quelconque des revendications précédentes 10 à 12, dans la mesure où elles sont rattachées à la revendication 9, caractérisé en ce que le tuyau métallique (13, 111, 112) est réalisé sous la forme d'un tuyau métallique ondulé à parois multiples.
  14. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que le conduit est un tube absorbeur (4) de la centrale héliothermique, dans lequel de l'énergie est fournie au fluide porteur au moyen de collecteurs solaires (12).
  15. Système de raccordement selon l'une quelconque des revendications précédentes, caractérisé en ce que la centrale héliothermique présente des miroirs striés paraboliques (12), qui peuvent pivoter autour de l'axe de rotation (A).
EP09781697.9A 2008-08-14 2009-08-11 Système de raccordement pour une centrale héliothermique Active EP2326864B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008037711A DE102008037711A1 (de) 2008-08-14 2008-08-14 Anschlusssystem für ein um eine Drehachse schwenkbares Leitungsrohr einer solarthermischen Anlage
PCT/EP2009/060375 WO2010018166A2 (fr) 2008-08-14 2009-08-11 Système de raccordement pour un tube de conduite pivotant autour d'un axe de rotation, dans une centrale héliothermique

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EP2326864A2 EP2326864A2 (fr) 2011-06-01
EP2326864B1 true EP2326864B1 (fr) 2017-07-26

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DE (1) DE102008037711A1 (fr)
DK (1) DK2326864T3 (fr)
ES (1) ES2644273T3 (fr)
PT (1) PT2326864T (fr)
WO (1) WO2010018166A2 (fr)

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Publication number Publication date
DE102008037711A1 (de) 2010-02-18
EP2326864A2 (fr) 2011-06-01
WO2010018166A2 (fr) 2010-02-18
US20110291405A1 (en) 2011-12-01
DK2326864T3 (da) 2017-11-13
WO2010018166A3 (fr) 2010-10-21
PT2326864T (pt) 2017-10-26
ES2644273T3 (es) 2017-11-28
US9127862B2 (en) 2015-09-08

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